Proverbs 20:15-17

Revised Standard Version

¹⁵ There is gold, and abundance of costly stones;
    but the lips of knowledge are a precious jewel.
¹⁶ Take a man’s garment when he has given surety for a stranger,
    and hold him in pledge when he gives surety for foreigners.
¹⁷ Bread gained by deceit is sweet to a man,
    but afterward his mouth will be full of gravel.